body{
    width: 100%;
    height: 100%;
    background: url(img/img.jpg) no-repeat;
    background-size: 100% 100%;
    overflow: hidden;
    user-select: none;
}

.container{
    text-align: center;
    margin: 200px auto;
}

li{
    position: relative;
    display: inline-block;
    width:50px;
    height: 200px;
    background-color: #fff;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.5em;
    box-shadow: 0  0  5px 3px rgba(0, 0, 0, 0.5);
}

li span{
    position: absolute;
    width: 100%;
    left: 0;
    bottom: 20px;
}

.low::after{
    content: '.';
    position: absolute;
    left: 0;
    bottom: 10px;
    width: 100%;

}

.high::after{
    content: '.';
    position: absolute;
    left: 0;
    bottom: 45px;
    width: 100%;
}